anv,iris: Move the SHADER_RELOC enums to brw_compiler.h

They're common between the two drivers and we want to add a couple more
that get emitted from code in src/intel/compiler.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8637>

src/intel/compiler/brw_compiler.h

@@ -675,6 +675,11 @@ enum brw_param_builtin {
 #define BRW_PARAM_BUILTIN_CLIP_PLANE_COMP(param) \
    (((param) - BRW_PARAM_BUILTIN_CLIP_PLANE_0_X) & 0x3)
 
+enum brw_shader_reloc_id {
+   BRW_SHADER_RELOC_CONST_DATA_ADDR_LOW,
+   BRW_SHADER_RELOC_CONST_DATA_ADDR_HIGH,
+};
+
 /** Represents a code relocation
  *
  * Relocatable constants are immediates in the code which we want to be able